title: Impact of signal-ASE four-wave mixing on the effectiveness of digital back-propagation in 112 Gb/s PM-QPSK systems.
abstract: Limitations in the performance of coherent transmission systems employing digital back-propagation due to four-wave mixing impairments are reported for the first time. A significant performance constraint is identified, originating from four-wave mixing between signals and amplified spontaneous emission noise which induces a linear increase in the standard deviation of the received field with signal power, and linear dependence on transmission distance.
authors.affiliation: Photonics Systems Group, Tyndall National Institute and Department of Electrical Engineering/Physics, University College Cork, Lee Maltings, Prospect Row, Cork, Ireland. danish.rafique@tyndall.ie
authors.forename: Danish
authors.initials: D
authors.lastname: Rafique
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Ellis